﻿#include "flowlayout.h"

#include <QStyle>
#include <QtWidgets>

#include "flowlayout.h"
FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
    : QLayout(parent)
    , m_hSpace(hSpacing)
    , m_vSpace(vSpacing)
{
    setContentsMargins(margin, margin, margin, margin);
}

FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
    : m_hSpace(hSpacing)
    , m_vSpace(vSpacing)
{
    setContentsMargins(margin, margin, margin, margin);
}

FlowLayout::~FlowLayout()
{
    QLayoutItem *item;
    while ((item = takeAt(0))) delete item;
}

QWidget *FlowLayout::emptyRow(int nHeight)
{
    LineBreakWidget *btnS = new LineBreakWidget();
    btnS->m_nHeight = nHeight;
    return btnS;
}

void FlowLayout::addEmptyRow(int nHeight)
{
    QWidget *btnS = emptyRow(nHeight);
    addWidget(btnS);
}

void FlowLayout::addItem(QLayoutItem *item) { itemList.append(item); }

int FlowLayout::horizontalSpacing() const
{
    if (m_hSpace >= 0)
    {
        return m_hSpace;
    }
    else
    {
        return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
    }
}

int FlowLayout::verticalSpacing() const
{
    if (m_vSpace >= 0)
    {
        return m_vSpace;
    }
    else
    {
        return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
    }
}

int FlowLayout::count() const { return itemList.size(); }

QLayoutItem *FlowLayout::itemAt(int index) const
{
    return itemList.value(index);
}

QLayoutItem *FlowLayout::takeAt(int index)
{
    if (index >= 0 && index < itemList.size())
        return itemList.takeAt(index);
    else
        return 0;
}

Qt::Orientations FlowLayout::expandingDirections() const { return 0; }

bool FlowLayout::hasHeightForWidth() const { return true; }

int FlowLayout::heightForWidth(int width) const
{
    int height = doLayout(QRect(0, 0, width, 0), true);
    return height;
}

void FlowLayout::setGeometry(const QRect &rect)
{
    QLayout::setGeometry(rect);
    doLayout(rect, false);
}

QSize FlowLayout::sizeHint() const { return minimumSize(); }

QSize FlowLayout::minimumSize() const
{
    QSize size;
    QLayoutItem *item;
    foreach (item, itemList)
        size = size.expandedTo(item->minimumSize());

    size += QSize(2 * margin(), 2 * margin());
    return size;
}

int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
{
    int left, top, right, bottom;
    getContentsMargins(&left, &top, &right, &bottom);
    QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
    int x = effectiveRect.x();
    int y = effectiveRect.y();
    int lineHeight = 0;

    QLayoutItem *item;
    foreach (item, itemList)
    {
        QWidget *wid = item->widget();

        auto sp = dynamic_cast<LineBreakWidget *>(wid);
        if (sp)
        {
            x = effectiveRect.x();  // 修改：使用effectiveRect.x()而不是rect.x()
            y += lineHeight;     // 移动到下一行
            y += sp->m_nHeight;  // 添加额外的高度
            lineHeight = 0;
            continue;
        }

        int spaceX = horizontalSpacing();
        if (spaceX == -1)
            spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton,
                                                 QSizePolicy::PushButton,
                                                 Qt::Horizontal);
        int spaceY = verticalSpacing();
        if (spaceY == -1)
            spaceY = wid->style()->layoutSpacing(
                QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
        int nextX = x + item->sizeHint().width() + spaceX;
        if (nextX - spaceX > effectiveRect.right() && lineHeight > 0)
        {
            x = effectiveRect.x();
            y = y + lineHeight + spaceY;
            nextX = x + item->sizeHint().width() + spaceX;
            lineHeight = 0;
        }

        if (!testOnly) item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));

        x = nextX;
        lineHeight = qMax(lineHeight, item->sizeHint().height());
    }
    return y + lineHeight - rect.y() + bottom;
}
int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
{
    QObject *parent = this->parent();
    if (!parent)
    {
        return -1;
    }
    else if (parent->isWidgetType())
    {
        QWidget *pw = static_cast<QWidget *>(parent);
        return pw->style()->pixelMetric(pm, 0, pw);
    }
    else
    {
        return static_cast<QLayout *>(parent)->spacing();
    }
}
